مساهمة أجزاء المصدر في امتلاء الحبوب لدى عدد من طرز الشعير (Hordeum vulgare L.)‎

Abstract EN

The performance of several barley genotypes (wild relatives, landraces and varieties) was evaluated under rain-fed conditions at two environmentally different sites (Dara’a and Al-Swaida’a) in Syria, in order to assess the genetic variability of the source (stem and leaves) contribution to grain filling.

The trial was laid out according to the complete randomized block design with three replicates.

Barley genotypes responded differently to the dry farming system.

The performance of all genotypes was significantly better at the more humid site (Izra’a) compared to the dry Hoot site.

The stem contribution to the grain filling was significantly higher in the landraces: Swaida’a3, Swaida’a2, Swaida’a1, and the varieties: Fourat3, Acsad60 (1 0.18, 9.43 , 9.10, 8.02, 7.82g/plant respectively), although no significant differences were found among them.

On the other hand, stem contribution to final grain weight was found to be the lowest among the wild relatives.

Again, no significant differences were found among them in this regard.

The results indicated that the stem thickness was correlated with the improvement of barley grain yield in the water-stressed environments in all genotypes, because the translocation of photo-assimilates from stem (source) into grains (sink) is more tolerant than the translocation of photo-assimilates from the leaves.

The dry matter stored in wild relative’s stems and the mobilization to grains were inefficient, explaining their inferior production capacity under water-limited conditions.